stderr 'go: invalid GORISCV64: must be rva20u64, rva22u64'

env GOARCH=riscv64
env GORISCV64=
go list -f '{{context.ToolTags}}'
stdout 'riscv64.rva20u64'

env GOARCH=386
env GO386=sse2
go list -f '{{context.ToolTags}}'
stdout '386.sse2'

env GOARCH=wasm
env GOWASM=satconv
go list -f '{{context.ToolTags}}'
stdout 'wasm.satconv'

-- go.mod --
module m

-- p.go --

package abi

const (
	// See abi_generic.go.

	// RAX, RBX, RCX, RDI, RSI, R8, R9, R10, R11.
	IntArgRegs = 9

	// X0 -> X14.
	FloatArgRegs = 15

	// We use SSE2 registers which support 64-bit float operations.
	EffectiveFloatRegSize = 8

// --------------------- //

func Mul2(f float64) float64 {
	// 386/sse2:"ADDSD",-"MULSD"
	// amd64:"ADDSD",-"MULSD"
	// arm/7:"ADDD",-"MULD"
	// arm64:"FADDD",-"FMULD"
	// ppc64x:"FADD",-"FMUL"
	// riscv64:"FADDD",-"FMULD"
	return f * 2.0
}

func DivPow2(f1, f2, f3 float64) (float64, float64, float64) {
	// 386/sse2:"MULSD",-"DIVSD"
	// amd64:"MULSD",-"DIVSD"
	// arm/7:"MULD",-"DIVD"

	// 386/sse2: `MOVSD\t8\([A-Z]+[0-9]*\)\([A-Z]+[0-9]*\*8\), X[0-9]+`
	//    arm64: `FMOVD\t\(R[0-9]*\)\(R[0-9]*<<3\), F[0-9]+`
	t = x[i+1]
	//    amd64: `MOVSD\tX[0-9]+, 8\([A-Z]+[0-9]*\)\([A-Z]+[0-9]*\*8\)`
	// 386/sse2: `MOVSD\tX[0-9]+, 8\([A-Z]+[0-9]*\)\([A-Z]+[0-9]*\*8\)`
	//    arm64: `FMOVD\tF[0-9]+, \(R[0-9]*\)\(R[0-9]*<<3\)`
	y[i+1] = t
	//    amd64: `MOVSD\t8\([A-Z]+[0-9]*\)\([A-Z]+[0-9]*\*[18]\), X[0-9]+`

func Init(arch *ssagen.ArchInfo) {
	arch.LinkArch = &x86.Link386
	arch.REGSP = x86.REGSP
	arch.SSAGenValue = ssaGenValue
	arch.SSAGenBlock = ssaGenBlock
	arch.MAXWIDTH = (1 << 32) - 1
	switch v := buildcfg.GO386; v {
	case "sse2":
	case "softfloat":
		arch.SoftFloat = true
	case "387":
		fmt.Fprintf(os.Stderr, "unsupported setting GO386=387. Consider using GO386=softfloat instead.\n")
		base.Exit(1)
	default:

// Options are arch dependent and are added by the arch specific doinit functions.
// Features that are mandatory for the specific GOARCH should not be added to options
// (e.g. SSE2 on amd64).
var options []option

// Option names should be lower case. e.g. avx instead of AVX.
type option struct {
	Name      string
	Feature   *bool

	// amd64:"SQRTSD"
	// 386/sse2:"SQRTSD" 386/softfloat:-"SQRTD"
	// arm64:"FSQRTD"
	// arm/7:"SQRTD"
	// mips/hardfloat:"SQRTD" mips/softfloat:-"SQRTD"
	// mips64/hardfloat:"SQRTD" mips64/softfloat:-"SQRTD"
	// wasm:"F64Sqrt"
	// ppc64x:"FSQRT"
	// riscv64: "FSQRTD"
	return math.Sqrt(x)
}

func sqrt32(x float32) float32 {
	// amd64:"SQRTSS"
	// 386/sse2:"SQRTSS" 386/softfloat:-"SQRTS"
	// arm64:"FSQRTS"

}

func Mul_n120(n int) int {
	// s390x:`SLD\t[$]3`,`SLD\t[$]7`,-`MULLD`
	return n * -120
}

func MulMemSrc(a []uint32, b []float32) {
	// 386:`IMULL\s4\([A-Z]+\),\s[A-Z]+`
	a[0] *= a[1]
	// 386/sse2:`MULSS\s4\([A-Z]+\),\sX[0-9]+`
	// amd64:`MULSS\s4\([A-Z]+\),\sX[0-9]+`
	b[0] *= b[1]
}

// Multiplications merging tests

func MergeMuls1(n int) int {
	// amd64:"IMUL3Q\t[$]46"
	// 386:"IMUL3L\t[$]46"

		{Name: "sse41", Feature: &X86.HasSSE41},
		{Name: "sse42", Feature: &X86.HasSSE42},
		{Name: "ssse3", Feature: &X86.HasSSSE3},

		// These capabilities should always be enabled on amd64:
		{Name: "sse2", Feature: &X86.HasSSE2, Required: runtime.GOARCH == "amd64"},
	}
}

func archInit() {

	Initialized = true

	maxID, _, _, _ := cpuid(0, 0)

	if maxID < 1 {
		return
	}

// Options are arch dependent and are added by the arch specific initOptions functions.
// Features that are mandatory for the specific GOARCH should have the Required field set
// (e.g. SSE2 on amd64).
var options []option

// Option names should be lower case. e.g. avx instead of AVX.
type option struct {
	Name      string
	Feature   *bool